package com.pyw.http_client_test.util;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;

import org.apache.commons.io.IOUtils;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.config.RequestConfig.Builder;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.TrustStrategy;
import org.apache.http.util.EntityUtils;

public class HttpUtil {
private static PoolingHttpClientConnectionManager connectionManager;
	
	private static RequestConfig requestConfig;
	
	private static final int MAX_TIMEOUT = 50000;
	
	static {
		// 设置连接池
		connectionManager = new PoolingHttpClientConnectionManager();
		// 设置连接池大小
		connectionManager.setMaxTotal(100);
		connectionManager.setDefaultMaxPerRoute(connectionManager.getMaxTotal());
		// Validate
		connectionManager.setValidateAfterInactivity(5000);
		Builder configBuilder = RequestConfig.custom();
		// 设置连接超时
		configBuilder.setConnectTimeout(MAX_TIMEOUT);
		// 设置读取超时
		configBuilder.setSocketTimeout(MAX_TIMEOUT);
		// 设置从连接池获取实例的超时
		configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT);
		
		requestConfig = configBuilder.build();
	}
	
	/**
	 * 发送GET请求（HTTP），不带输入数据
	 * @param url
	 * @return
	 */
	public static String dogGet(String url) {
		return doGet(url,new HashMap<String, Object>());
	}
	
	/**
	 * 发送 GET 请求（HTTP），K-V形式
	 * @param url
	 * @param params
	 * @return
	 */
	public  static String doGet(String url, HashMap<String, Object> params) {
		String apiUrl = url;
		StringBuffer param = new StringBuffer();
		int i = 0;
		for(String key: params.keySet()) {
			if (i == 0) {
				param.append("?");
			} else {
				param.append("&");
			}
			param.append(key).append("=").append(params.get(key));
			i++;
		}
		apiUrl+=param;
		String result = null;
		HttpClient httpClient = null;
		if (apiUrl.startsWith("https")) {
			httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory())
					.setConnectionManager(connectionManager).setDefaultRequestConfig(requestConfig).build();
		} else {
			httpClient = HttpClients.createDefault();
		}
		try {
			HttpGet httpGet = new HttpGet(apiUrl);
			HttpResponse response = httpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			if (entity != null) {
				InputStream inputStream = entity.getContent();
				result = IOUtils.toString(inputStream,"UTF-8");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	/**
	 * 发送 GET 请求（HTTP），K-V形式
	 * @param url
	 * @param params
	 * @return
	 */
	public  static String doGet(String url,HashMap<String, Object> params,Header header) {
		String apiUrl = url;
		if (params != null) {
			StringBuffer param = new StringBuffer();
			int i = 0;
			for(String key: params.keySet()) {
				if (i == 0) {
					param.append("?");
				} else {
					param.append("&");
				}
				param.append(key).append("=").append(params.get(key));
				i++;
			}
			apiUrl+=param;
		}
		String result = null;
		HttpClient httpClient = null;
		if (apiUrl.startsWith("https")) {
			httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory())
					.setConnectionManager(connectionManager).setDefaultRequestConfig(requestConfig).build();
		} else {
			httpClient = HttpClients.createDefault();
		}
		try {
			HttpGet httpGet = new HttpGet(apiUrl);

			if (header != null) {
				httpGet.setHeader(header);
			}
			HttpResponse response = httpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			if (entity != null) {
				InputStream inputStream = entity.getContent();
				result = IOUtils.toString(inputStream,"UTF-8");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
	
	/**
	 * 发送 POST 请求（HTTP），不带输入数据
	 * @param apiUrl
	 * @return
	 */
	public static String doPost(String apiUrl) {
		return doPost(apiUrl,new HashMap<String, Object>());
	}
	
	/**
	 * 发送 POST 请求，K-V形式
	 * @param apiUrl API接口URL
	 * @param params 参数map
	 * @return
	 */
	private static String doPost(String apiUrl, HashMap<String, Object> params) {
		CloseableHttpClient httpClient = null;
		if (apiUrl.startsWith("https")) {
			httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory())
			.setConnectionManager(connectionManager).setDefaultRequestConfig(requestConfig).build();
		} else {
			httpClient = HttpClients.createDefault();
		}
		String httpStr = null;
		HttpPost httpPost = new HttpPost(apiUrl);
		CloseableHttpResponse response = null;
		try {
			httpPost.setConfig(requestConfig);
			List<NameValuePair> pairList =  new ArrayList<>(params.size());
			for (Map.Entry<String, Object> entry: params.entrySet()) {
				NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry.getValue() != null ? entry.getValue().toString(): "");
				pairList.add(pair);
				
			}
			httpPost.setEntity(new UrlEncodedFormEntity(pairList,Charset.forName("UTF-8")));
			response = httpClient.execute(httpPost);
			HttpEntity entity = response.getEntity();
			httpStr = EntityUtils.toString(entity,"UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			if (response != null) {
				try {
					EntityUtils.consume(response.getEntity());
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		return httpStr;
	}
	
	/**
	 *  发送 POST 请求，JSON形式，接收端需要支持json形式，否则取不到数据
	 * @param apiUrl
	 * @param json
	 * @return
	 */
	public static String doPost(String apiUrl, String json) {
		  CloseableHttpClient httpClient = null;
	        if (apiUrl.startsWith("https")) {
	            httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory()).setConnectionManager(connectionManager).setDefaultRequestConfig(requestConfig).build();
	        } else {
	            httpClient = HttpClients.createDefault();
	        }
	        String httpStr = null;
	        HttpPost httpPost = new HttpPost(apiUrl);
	        CloseableHttpResponse response = null;

	        try {
	            httpPost.setConfig(requestConfig);
	            StringEntity stringEntity = new StringEntity(json, "UTF-8");// 解决中文乱码问题
	            stringEntity.setContentEncoding("UTF-8");
	            stringEntity.setContentType("application/json");
	            httpPost.setEntity(stringEntity);
	            response = httpClient.execute(httpPost);
	            HttpEntity entity = response.getEntity();
	            httpStr = EntityUtils.toString(entity, "UTF-8");
	        } catch (IOException e) {
	            e.printStackTrace();
	        } finally {
	            if (response != null) {
	                try {
	                    EntityUtils.consume(response.getEntity());
	                } catch (IOException e) {
	                    e.printStackTrace();
	                }
	            }
	        }
	        return httpStr;
	}

	/**
	 * 创建SSL安全连接
	 * @return
	 */
	private static SSLConnectionSocketFactory createSSLConnSocketFactory() {
		SSLConnectionSocketFactory sslsf = null;
		try {
			SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null,new TrustStrategy() {
				@Override
				public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
					
					return true;
				}
			}).build();
			sslsf = new SSLConnectionSocketFactory(sslContext,new HostnameVerifier() {
				@Override
				public boolean verify(String hostname, SSLSession session) {
					return true;
				}
			});
		} catch (Exception e) {
			e.printStackTrace();
		}
		return sslsf;
	}
}
